Facepiece rib



FIG. 1 is a front perspective view showing the new design for facepiece rib;

FIG. 2 is a front view thereof;

FIG. 3 is a back view thereof;

FIG. 4 is a top view thereof;

FIG. 5 is a bottom view thereof; and,

FIG. 6 is a right side view thereof, the left side view being a mirror image.

The broken line showing of a mask is included for the purpose of illustrating environment and forms no part of the claimed design.

The shading is provided to illustrate contour only and is not an indication of surface texture or sheen. 

CLAIM The ornamental design for facepiece rib, as shown and described. 